Sump filter design
I had a few reasons for wanting to make my own plywood sump:
Intended sump layout in tank cabinet
From the reject shop:
I used a miter & corner clamp to ensure the butt joints were square
The plywood was cut into the following lengths:
I started by joining the long sides to the base. This is how I did it:
I used the miter & corner clamps to get the ends square as well
I attached the ends using much the same process, using 4 screws and gluing the end. I wiped away the glue with a damp cloth.
End removed for gluing
End put back and screwed down
"Look Daddy! It's a house!"
I drilled a large hole for my bulkhead. This took a LONG time using my wife's battery powered drill!
I then drilled and added screws along every join in the tank, with the screws spaced about 60mm apart.
Holes drilled for the rest of the screws and the bulkhead for sump drain fitted
I added screws every 60mm
I then added a couple of 30mm x 30mm pine bars to ensure the sides don't bow. This was probably overkill.
Pine bars clamped on
I lined the seams inside the sump with cloth tape. I figured that this would help prevent any leaks because the liquid rubber would have a solid surface to push against. I'll soon find out if my idea is correct...
Cloth tape over corner seam
I applied the first coat of liquid rubber. It didn't seem to bond to the tape. I will avoid using tape on future projects.
Liquid rubber painted over tape
Geo-cloth pressed into liquid rubber over seams
Close up of geo-cloth corner
Second layer of liquid rubber painted over geo-cloth
Then, typically of me, I put the project away and haven't touched it since. Must get it back out and finish it!